The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 16, 2003
Filed:
Jun. 09, 2000
Neal Bertram Schirle, Morgan Hill, CA (US);
Hitachi Global Storage Technologies Netherlands B.V., Amsterdam, NL;
Abstract
A secondary servo actuator system for use in disk drives comprising a controller and two PZT transducers mounted on each suspension load beam in an arm assembly. When a seek operation is initiated the acceleration of the arms generates vibration modes. The PZT transducers on a suspension adjacent to the target head/suspension sense the vibration motion and provide output signals to the controller. The controller filters the signal and generates a control signal for the PZTs mounted on the target arm/suspension. The deformation of the PZTs in turn rotates the arm load beam and thereby adjusts the position of the target head to compensate for arm motion caused by the vibration modes. The secondary actuator system can be used during the deceleration trajectory of a target head to suppress lower order arm sway frequencies. The milliactuator of the target head can also be used to sense the phase and amplitude of the dominant arm sway mode to enable the deceleration control signal to be applied with a phase relation that suppresses the arm sway mode that was excited upon application of seek servo actuator control.